That's $12.50 a serving. Sounds a bit excessive to me based on the design you mentioned, even if it is fondant. Is a delivery charge in that amount? There's a great thread on here about pricing. I'll see if I can find it and post the link. I'm not a professional by any means, but when I get my business going, if I had the date available, I wouldn't charge any different just because it's short notice. You always have the option not to do the cake.